Method for repairing diffuser of hydraulic component of main pump of nuclear power plant

Abstract

The application provides a diffuser repair method of a nuclear power plant main pump hydraulic component, relates to the technical field of nuclear power plant main pump hydraulic component repair, and comprises the following steps: dividing a plurality of matching surfaces of the diffuser into a first matching surface and a second matching surface; clamping the diffuser on a workbench in a first direction; the first direction is that a guide vane part of the diffuser faces the workbench; obtaining a first deformation amount of the first matching surface, and cutting the first matching surface according to the first deformation amount; clamping the diffuser on the workbench in a second direction; the second direction is that a flange part of the diffuser faces the workbench; obtaining a second deformation amount of the second matching surface, and cutting the second matching surface according to the second deformation amount. The method can reduce the clamping times of the diffuser on the workbench, reduce the generation and accumulation of positioning errors, and improve the repair accuracy of the diffuser.

Description

Technical Field

[0001] This application belongs to the technical field of repairing hydraulic components of main pumps in nuclear power plants, and more specifically, it relates to a method for repairing the diffuser of hydraulic components of main pumps in nuclear power plants. Background Technology

[0002] Various types of pumps operate in all systems of a nuclear power plant. Among them, in the primary loop system of the nuclear island, the pump used to drive the coolant to circulate within the reactor coolant system is called the nuclear main pump. The main pump is located in the heart of the nuclear island and is used to drive the coolant to circulate within the reactor cooling system. It continuously transfers the heat generated in the reactor core to the steam generator and converts it into thermal energy. It is the key to controlling the water circulation in nuclear power plant operations and belongs to the first-level equipment of the nuclear power plant.

[0003] After a long period of operation, the fitting dimensions of the hydraulic components inside the main pump of a nuclear power plant may be slightly deformed due to the operating conditions. It is necessary to disassemble the main pump regularly and inspect and maintain its components to eliminate potential safety hazards in subsequent operation.

[0004] The diffuser is one of the hydraulic components in the main pump of a nuclear power plant. It consists of a flange, a cylindrical body, and guide vanes. It is used to mate with components such as the heat shield, pump casing, suction guide sleeve, impeller, and labyrinth seal in the hydraulic components of the main pump. The flange, cylindrical body, and guide vanes of the diffuser have many mating surfaces. These mating surfaces will deform during use, requiring repair of multiple mating surfaces on the diffuser.

[0005] However, due to the complex structure of the diffuser, the different shapes and sizes of the mating surfaces and their chaotic distribution, conventional repair methods require multiple clamping of the diffuser, which leads to reduced positioning accuracy, more accumulated errors, and difficulty in ensuring repair accuracy. Summary of the Invention

[0006] The purpose of this application is to provide a method for repairing the diffuser of the hydraulic components of the main pump in a nuclear power plant, so as to solve the problem that the complex structure of the diffuser makes it difficult to ensure repair accuracy in the prior art.

[0007] To achieve the above objectives, this application provides a method for repairing the diffuser of a hydraulic component of a main pump in a nuclear power plant. The diffuser includes a flange, a cylindrical body, and guide vanes. The processing equipment for repairing the diffuser includes a workbench. The diffuser repair method includes:

[0008] The multiple mating surfaces of the diffuser are divided into a first mating surface and a second mating surface; the first mating surface includes a mating surface located on the flange portion and a mating surface located on the cylindrical portion facing and near the flange portion; the second mating surface includes a mating surface located on the guide vane portion and a mating surface located on the cylindrical portion facing and near the guide vane portion;

[0009] The diffuser is clamped onto the worktable along a first direction; the first direction is the direction in which the guide vane faces the worktable.

[0010] Obtain the first deformation amount of the first mating surface, and cut the first mating surface according to the first deformation amount;

[0011] The diffuser is clamped onto the worktable along a second direction; the second direction is the direction in which the flange faces the worktable.

[0012] Obtain the second deformation amount of the second mating surface, and cut the second mating surface according to the second deformation amount.

[0013] In some embodiments, the worktable is equipped with a support pad; clamping the diffuser onto the worktable along a first direction includes:

[0014] Support blocks are installed on the workbench; the number of support blocks is multiple and they are arranged in a circular pattern.

[0015] The guide vane abuts against the end face of the support pad that faces away from the worktable.

[0016] A first fixing component is installed on the workbench, and the first fixing component is multiple and surrounds the periphery of the diffuser;

[0017] The diffuser is clamped in the first clamping position by using the first fixing component to hold the cylindrical part.

[0018] In some embodiments, clamping the cylindrical portion using the first fixing component and mounting the diffuser in a first mounting position includes:

[0019] The first fixing component clamps the cylindrical portion with a first pre-clamping force;

[0020] Measure the initial runout value of the first mating surface and adjust the relative position of the diffuser and the worktable to minimize the initial runout value.

[0021] Measure the first retest runout value of the first mating surface;

[0022] When the difference between the first initial measurement runout value and the first remeasured runout value is within a first range threshold, the diffuser is determined to be in the first clamping position, and the first fixing component clamps the cylinder part with a first fixed clamping force; the first fixed clamping force is greater than the first pre-clamping force.

[0023] In some embodiments, obtaining a first deformation amount of the first mating surface and cutting the first mating surface according to the first deformation amount includes:

[0024] Based on the shape of the first mating surface, the first mating surface is divided into a first mating end face and a first mating circumferential surface;

[0025] The deformation of the first end face is measured, and the first mating end face is cut according to the deformation of the first end face. The deformation of the first end face is the deformation of the first mating end face in the first deformation.

[0026] The deformation of the first circumferential surface is measured, and the first mating circumferential surface is cut according to the deformation of the first circumferential surface. The deformation of the first circumferential surface is the deformation of the first mating circumferential surface in the first deformation.

[0027] In some embodiments, the number of first mating end faces is multiple, and the deformation amount of the first end face is corresponding to multiple values. Measuring the deformation amount of the first end face and cutting the first mating end face according to the deformation amount includes:

[0028] At least one of the first mating end faces is selected as the first reference surface. The deformation amount of the first end face corresponding to the first reference surface is determined according to the first remeasured runout value. The first reference surface is then cut according to the deformation amount of the first end face corresponding to the first reference surface.

[0029] Using the first reference surface after cutting as a reference, determine the deformation amount of the first end face corresponding to each of the remaining first mating end faces, and cut each of the remaining first mating end faces.

[0030] In some embodiments, the worktable is provided with lathe chucks and support pads; clamping the diffuser onto the worktable along the second direction includes:

[0031] Support blocks are installed on the workbench; the number of support blocks is multiple and they are arranged in a circular pattern.

[0032] The flange portion abuts against the end face of the support pad that faces away from the workbench;

[0033] The flange is clamped using the lathe jaws, and the diffuser is clamped in the second clamping position.

[0034] In some embodiments, using the lathe chuck to clamp the flange portion and mount the diffuser in a second clamping position includes:

[0035] The lathe jaws clamp the flange with a second pre-clamping force;

[0036] Measure the second initial runout value of the second mating surface, and adjust the relative position of the diffuser and the worktable to minimize the second initial runout value;

[0037] Measure the second retest runout value of the second mating surface;

[0038] When the difference between the second initial measurement runout value and the second remeasured runout value is within the second range threshold, the diffuser is determined to be in the second clamping position, and the second fixing component clamps the cylinder part with a second fixed clamping force; the second fixed clamping force is greater than the second pre-clamping force.

[0039] In some embodiments, obtaining the second deformation amount of the second mating surface and cutting the second mating surface according to the second deformation amount includes:

[0040] Based on the shape of the second mating surface, the second mating surface is divided into a second mating end face and a second mating circumferential surface;

[0041] Measure the deformation of the second end face, and cut the second mating end face according to the deformation of the second end face. The deformation of the second end face is the deformation of the second mating end face in the second deformation amount.

[0042] The deformation of the second circumferential surface is measured, and the second mating circumferential surface is cut according to the deformation of the second circumferential surface. The deformation of the second circumferential surface is the second deformation of the second mating circumferential surface.

[0043] In some embodiments, the number of second mating end faces is multiple, and the deformation amount of the second end face is correspondingly multiple. Measuring the deformation amount of the second end face and cutting the second mating end face according to the deformation amount includes:

[0044] Select at least one of the second mating end faces as the second reference surface, determine the deformation amount of the second end face corresponding to the second reference surface based on the second remeasured runout value, and cut the second reference surface based on the deformation amount of the second end face corresponding to the second reference surface;

[0045] Using the second reference surface after cutting as a reference, determine the second end deformation amount corresponding to each of the remaining second mating end faces, and cut each of the remaining second mating end faces.

[0046] In some embodiments, clamping the diffuser along the second direction onto the worktable further includes:

[0047] A second fixing component is installed on the workbench, and the second fixing component is used to apply axial pressure toward the workbench to the flange portion; there are multiple second fixing components and they are arranged around the periphery of the diffuser.

[0048] The beneficial effects of the diffuser repair method for the hydraulic components of the main pump in a nuclear power plant provided in this application are as follows: Based on the structural characteristics of the diffuser, its multiple mating surfaces are subdivided into flange mating surfaces, first cylinder mating surfaces, second cylinder mating surfaces, and guide vane mating surfaces. By fixing the diffuser on the worktable with the flange portion facing or the guide vane portion facing, the flange mating surfaces and the first cylinder mating surfaces can be measured and repaired separately. Similarly, the guide vane mating surfaces and the second cylinder mating surfaces can be measured and repaired. This clamping method not only facilitates the positioning and fixing of the diffuser but also improves the convenience of the repair work, reduces the repair difficulty, and improves the repair quality. By reducing the number of times the diffuser is clamped on the worktable and reducing the generation and accumulation of positioning errors, the accuracy of the mating surface repair can be improved. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the diffuser structure in the background art of this application;

[0051] Figure 2 This is a top view of the worktable of the vertical lathe in an embodiment of this application;

[0052] Figure 3 This is a flowchart of the diffuser repair method in the embodiments of this application;

[0053] Figure 4 This is a top view of multiple support pads installed on the workbench in an embodiment of this application;

[0054] Figure 5 This is a schematic diagram of the structure of the diffuser being clamped on the worktable along the first direction in an embodiment of this application;

[0055] Figure 6 This is a partial view of the jaw seat, nut seat, drive screw, and fixed jaw of the first fixing component in the embodiment of this application;

[0056] Figure 7 This is an exploded view of the jaw seat, nut seat, drive screw, and fixed jaw of the first fixing component in the embodiment of this application;

[0057] Figure 8 This is a cross-sectional view of the adjustment component in an embodiment of this application;

[0058] Figure 9 This is a schematic diagram of the structure of the diffuser in this application, which is clamped to the worktable along the second direction;

[0059] Figure 10 This is a cross-sectional view of the second fixing component in an embodiment of this application.

[0060] The following are the labeling elements in the figure:

[0061] 10-Diffuser; 11-Flange; 12-Cylinder; 13-Guide vane; 101a-First end face; 101d-Second end face; 101f-Third end face; 101s-Fourth end face; 101p-Fifth end face; 101g-Sixth end face; 101h-Seventh end face; 101k-Eighth end face; 101n-Ninth end face; 101b-First outer circular surface; 101c-Second outer circular surface; 101r-Third outer circular surface; 101e-First inner circular surface; 101q-Second inner circular surface; 101z-Third inner circular surface; 101w-Fourth inner circular surface; 101m-Fifth inner circular surface; 101i-Sixth inner circular surface; 101j- 7th inner circular surface; 101u - inner surface of the first groove; 101v - inner surface of the second groove; 20 - worktable; 21 - T-slot; 22 - lathe chuck; 23 - T-bolt; 24 - T-nut; 30 - first fixing component; 31 - base; 32 - fixing chuck; 33 - chuck seat; 34 - drive screw; 35 - nut seat; 40 - second fixing component; 41 - bottom pad; 411 - connecting screw; 42 - pressure plate; 43 - adjusting pad; 431 - adjusting screw; 44 - pressure component; 441 - pressure screw; 442 - pressure nut; 50 - support pad; 60 - adjusting component; 61 - support seat; 62 - adjusting head. Detailed Implementation

[0062] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0063] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0064] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0066] like Figure 1 As shown, the diffuser 10 includes a flange portion 11, a cylindrical portion 12, and a guide vane portion 13. The cylindrical portion 12 is hollow inside. The flange portion 11 and the guide vane portion 13 are respectively disposed at both ends of the cylindrical portion 12 in the axial direction. The flange portion 11, the cylindrical portion 12, and the guide vane portion 13 all have multiple mating surfaces for cooperating with other components in the main pump. After a period of use, the mating surfaces on the diffuser 10 will deform due to long-term stress, resulting in the size of the mating surfaces increasing or decreasing compared to the design size.

[0067] This application provides a method for repairing the diffuser 10 of a nuclear power plant main pump. By measuring the dimensional deformation of each mating surface of the diffuser 10 and machining the mating surfaces, the dimensional accuracy of the mating surfaces can be restored, thereby achieving the purpose of repairing the diffuser 10 and ensuring that the connection and fit between the diffuser 10 and other components in the main pump meet the design requirements.

[0068] The machining equipment used for cutting and repairing the diffuser 10 can be a vertical lathe, a milling machine, a grinding machine, or a multi-axis machining center. A vertical lathe includes a machine body, a worktable 20, a vertical tool post, and a side tool post. The worktable 20 is rotatably connected to the machine body via a spindle. Figure 2As shown, the upper surface of the worktable 20 has multiple T-slots 21 and multiple lathe jaws 22. A vertical tool post is vertically positioned above the worktable 20, and a side tool post is horizontally positioned to one side of the worktable 20. Both the vertical and side tool posts are used to mount cutting tools. When repairing the diffuser 10, the diffuser 10 is mounted on the worktable 20 with its axis vertical. The worktable 20 rotates the diffuser 10, and the cutting tools on the vertical or side tool post are used to cut the mating surfaces of the diffuser 10 to restore its dimensional accuracy.

[0069] like Figure 3 As shown in the embodiment of this application, the repair method for the main pump diffuser 10 of a nuclear power plant includes steps S301 to S305.

[0070] In step S301, the plurality of mating surfaces of the diffuser 10 are divided into a first mating surface and a second mating surface; the first mating surface includes a mating surface located on the flange portion 11 and a mating surface located on the cylinder portion 12 facing and close to the flange portion 11; the second mating surface includes a mating surface located on the guide vane portion 13 and a mating surface located on the cylinder portion 12 facing and close to the guide vane portion 13.

[0071] Specifically, refer to Figure 1 The flange 11 has multiple mating surfaces including: a first end face 101a, a second end face 101d, a third end face 101f, a first outer circular surface 101b, a second outer circular surface 101c, a first inner circular surface 101e, a first inner groove inner surface 101u, a second inner groove inner surface 101, and a second inner groove inner surface 101v. These mating surfaces can all be classified as first mating surfaces. The guide vane 13 has multiple mating surfaces including: a fourth end face 101s, a fifth end face 101p, a third outer circular surface 101r, a second inner circular surface 101q, and a third inner circular surface 101z. These mating surfaces can all be classified as second mating surfaces.

[0072] The multiple mating surfaces on the cylinder section 12 include: a sixth end face 101g, a seventh end face 101h, an eighth end face 101k, a ninth end face 101n, a fourth inner circular surface 101w, a fifth inner circular surface 101m, a sixth inner circular surface 101i, and a seventh inner circular surface 101j. Among them, the sixth end face 101g, the seventh end face 101h, and the fourth inner circular surface 101w all face towards or are close to the flange section 11 and can all be classified as first mating surfaces; the eighth end face 101k, the ninth end face 101n, the fifth inner circular surface 101m, the sixth inner circular surface 101i, and the seventh inner circular surface 101j all face towards or are close to the guide vane section 13 and can all be classified as second mating surfaces.

[0073] By dividing the multiple mating surfaces of the diffuser 10 into first mating surfaces and second mating surfaces according to the structural characteristics of the diffuser 10, in the subsequent repair process, the diffuser 10 can be clamped in one clamping posture to process all the first mating surfaces simultaneously, and then the diffuser 10 can be clamped in another clamping method to process all the second mating surfaces simultaneously, so as to achieve the purpose of completing the repair of all mating surfaces in two clampings, reducing the number of clampings of the diffuser 10, reducing the generation of positioning errors, and improving the repair accuracy of the diffuser 10.

[0074] In step S302, the diffuser 10 is clamped onto the worktable 20 along a first direction; the first direction is the direction in which the guide vane portion 13 of the diffuser 10 faces the worktable 20.

[0075] like Figure 5 As shown, the worktable 20 of the vertical lathe is set horizontally. When the diffuser 10 is clamped on the worktable 20 along the first direction, the guide vane 13 of the diffuser 10 faces downward and the flange 11 faces upward. At this time, multiple first mating surfaces on the diffuser 10 are exposed above the worktable 20 for measurement and cutting repair of each first mating surface.

[0076] Combination Figure 4 and Figure 5 As shown, in some embodiments, clamping the diffuser 10 along a first direction onto the worktable 20 includes:

[0077] Install support pads 50 on the workbench 20;

[0078] The guide vane 13 of the diffuser 10 abuts against the end face of the support pad 50 facing away from the worktable 20.

[0079] Install the first fixing component 30 on the workbench 20;

[0080] The diffuser 10 is clamped in the first clamping position by using the first fixing component 30 to hold the cylindrical part 12.

[0081] Specifically, the support block 50 can be a circular block or other shaped block structure, and the bottom of the support block 50 can be fixed to the T-slot 21 on the worktable 20 by T-bolts 23. There should be multiple support blocks 50, for example, four support blocks 50.

[0082] Multiple support blocks 50 are arranged in a circle around the rotation axis of the worktable 20. The size of the support blocks 50 and the radius of their circular distribution should match the radius of the end faces on both sides of the diffuser 10. The tops of the support blocks 50 are flat, and the tops of the multiple support blocks 50 are flush to form a horizontal positioning surface, so that the end faces of the flange portion 11 and the guide vane portion 13 of the diffuser 10 can abut against the tops of the multiple support blocks 50. By using multiple support blocks 50 to support the diffuser 10 above the worktable 20, compared to directly using the surface of the worktable 20 to abut against the axial end face of the diffuser 10, the contact area of ​​the axial end face of the diffuser 10 is reduced, resulting in a smaller positioning error.

[0083] Furthermore, after the support pads 50 are installed on the worktable 20, the end faces of the support pads 50 facing away from the worktable 20 can be cut. Specifically, a cutting tool on a vertical lathe can be used to cut the tops of the support pads 50. When cutting the support pads 50, the vertical lathe is started, the worktable 20 is rotated, and the cutting tool is controlled to pass over the tops of each support pad 50 to cut the tops of all the support pads 50 simultaneously. This ensures that the tops of each support pad 50 are flush, eliminates installation errors caused by the support pads 50 during installation, and improves the planar accuracy of the positioning surface formed by the tops of multiple support pads 50, further improving the positioning accuracy of the axial end face of the diffuser 10.

[0084] When the guide vane 13 of the diffuser 10 abuts against the top surface of the support pad 50, an overhead crane or other lifting equipment in the workshop can be used to lift the diffuser 10 and move it above the support pad 50, and then slowly lower it so that the guide vane 13 of the diffuser 10 precisely abuts against the top of the support pad 50. During the descent of the diffuser 10, adjustments are made according to the relative position of the diffuser 10 and the multiple support pads 50. For example, when the diffuser 10 is close to the support pad 50, the movement is stopped. After fine-tuning the relative position of the diffuser 10 and each support pad 50, the diffuser 10 continues to move downward to ensure that the downward-facing end face of the guide vane 13 is in uniform contact with the end face of the support pad 50, avoiding tilting or offset. The multiple support pads 50 stably support the diffuser 10 on the worktable 20 with the guide vane 13 facing downward.

[0085] The first fixing component 30 is a clamping component used to apply radial force to the cylinder portion 12 of the diffuser 10 when the guide vane portion 13 is facing downwards. Multiple first fixing components 30 are also provided, and these components can be arranged in a circle around the axis of the worktable 20 and surround the periphery of the diffuser 10. Since the guide vane portion 13 has a complex shape and is difficult to clamp and apply force to, by using multiple first fixing components 30 to apply radial force to different positions of the cylinder portion 12, the diffuser 10 is fixed to the worktable 20 by clamping the cylinder portion 12. This solves the problem of the guide vane portion 13 not being able to be clamped, allowing the diffuser 10 to be stably clamped to the worktable 20 with the guide vane portion 13 facing downwards.

[0086] The installation order of the multiple first fixing components 30 can be arbitrary. For example, two or more of the first fixing components 30 can be installed first, and the diffuser 10 can be hoisted onto the support pad 50 before installing the remaining first fixing components 30. On the one hand, the multiple first fixing components 30 installed first are used to position the diffuser 10 for hoisting, and on the other hand, sufficient hoisting operation space is reserved for the diffuser 10 to facilitate the adjustment of the position of the diffuser 10 during the hoisting process. In addition, after the position of the diffuser 10 is determined, the relative position of each first fixing component 30 and the diffuser 10 can be adjusted again so that each fixing claw 32 is aligned with the cylindrical part 12 of the diffuser 10.

[0087] like Figures 5-7As shown, in some embodiments, the first fixing component 30 may include a base 31, a fixing claw 32, a claw seat 33, a drive screw 34, and a nut seat 35. The base 31 is mounted on the workbench 20, the claw seat 33 is connected to the side of the base 31 facing away from the workbench 20, the drive screw 34 is rotatably connected to the claw seat 33, the nut seat 35 is slidably connected to the claw seat 33, and the nut seat 35 is threadedly connected to the drive screw 34. The fixing claw 32 is connected to the nut seat 35. When installing the base 31 on the workbench 20, T-bolts 23 can be pre-embedded in the corresponding T-slots 21 of the workbench 20, and then the first fixing component 30 can be hoisted onto the workbench 20 as a whole using an overhead crane or other lifting equipment, so that the T-bolts 23 fix the base 31 to the workbench 20. The cylindrical body 12 also has a reference outer circular surface 101y. The height of the base 31 matches the height of the reference outer circular surface 101y when the guide vane portion 13 of the diffuser 10 is facing downwards, thereby supporting the height of the fixing claw 32 at the reference outer circular surface 101y of the cylindrical body 12. After the base 31 is fixed to the worktable 20, the axial direction of the drive screw 34 is parallel to the radial direction of the diffuser 10, and the fixing claw 32 faces the cylindrical body 12 of the diffuser 10. By rotating the drive screw 34, the fixing claw 32 moves toward the cylindrical body 12 until the fixing claw 32 abuts against the reference outer circular surface 101y of the cylindrical body 12, thereby applying a radial force to the cylindrical body 12 by the fixing claw 32.

[0088] Before sliding the fixing claw 32 towards the cylinder part 12, a protective gasket can be installed on the end of the fixing claw 32 facing the cylinder part 12. The protective gasket can be made of a metal material with low hardness, such as copper, or a non-metallic material. The shape of the protective gasket matches the outer surface of the cylinder part 12. The protective gasket can be clamped between the fixing claw 32 and the cylinder part 12, or it can be pre-fixed to the end of the fixing claw 32 facing the cylinder part 12 by means of adhesive bonding, fastener connection, etc. Under the action of the protective gasket, the damage to the cylinder part 12 caused by the fixing claw 32 when radial force is applied can be reduced, thus protecting the cylinder part 12.

[0089] In some embodiments, the diffuser 10 is clamped in a first clamping position by using the first fixing component 30 to hold the cylindrical portion 12, including:

[0090] The first fixing component 30 clamps the cylindrical part 12 with a first pre-clamping force;

[0091] Measure the initial runout value of the first mating surface and adjust the relative position of the diffuser 10 and the worktable 20 to minimize the initial runout value.

[0092] Measure the first re-measured runout value of the first mating surface;

[0093] When the difference between the first initial measurement runout value and the first remeasured runout value is within the first range threshold, the diffuser 10 is determined to be in the first clamping position, and the first fixing component 30 clamps the cylinder part 12 with a first fixed clamping force; the first fixed clamping force is greater than the first pre-clamping force.

[0094] The first pre-clamping force is a force applied in advance to the cylindrical portion 12 of the diffuser 10. Its purpose is to initially fix the diffuser 10 so that it can make a small displacement under the action of external force and adjust the clamping position of the diffuser 10. The magnitude of the first pre-clamping force can be judged according to process requirements or operator experience. For example, it can be made so that the end of the fixing claw 32 contacts the cylindrical portion 12 of the diffuser 10.

[0095] The first preliminary runout value refers to the radial runout measured using a special measuring tool between the rotation center line of the diffuser 10 cylinder 12 and the reference plane of the fixing component, in the initial state when the diffuser 10 cylinder 12 is in contact with the first fixing component 30. This value reflects the natural runout of the cylinder 12 when it is not subjected to any clamping force and is an important parameter for evaluating the machining accuracy and installation status of the cylinder 12. By measuring the first preliminary runout value, it is possible to preliminarily determine whether the concentricity of the cylinder 12 meets the technical requirements, providing a basis for subsequent adjustments and clamping.

[0096] The initial runout value can be measured using tools such as a dial indicator. During testing, the dial indicator is mounted on a vertical lathe, and the diffuser 10 is slowly rotated via the worktable 20. The change in the dial indicator reading is recorded to obtain the initial runout value. During the measurement process, the relative position of the diffuser 10 and the worktable 20 can be adjusted by adjusting the axial or radial displacement of the diffuser 10. This ensures good coaxiality between the reference axis of the diffuser 10 and the axis of the worktable 20, as well as good levelness of the end face of the diffuser 10, so that the deformation of the diffuser 10 can be accurately reflected in subsequent measurements.

[0097] The radial displacement of the diffuser 10 can be achieved by adjusting the positions of the fixing claws 32 at various locations. The axial displacement of the diffuser 10 can be achieved by installing at least one adjusting component 60 between the bottom of the diffuser 10 and the worktable 20, thereby changing the distance between the corresponding positions of the diffuser 10 and the worktable 20 using the adjusting component 60. For example, Figure 8 As shown, the adjustment assembly 60 may include a support base 61 and an adjustment head 62, with the bottom of the adjustment head 62 threadedly connected to the support base 61. The support base 61 can be fixed relative to the worktable 20 using T-bolts 23, and the adjustment head 62 can be rotated to abut against the downward-facing end face of the diffuser 10. By rotating the adjustment head 62, the height of the corresponding position of the diffuser 10 can be adjusted so that the planar runout value of the upward-facing end face of the diffuser 10 meets the process requirements.

[0098] The first re-measured runout value refers to the runout value of the diffuser 10 after its position has been adjusted, measured again using tools such as a dial indicator, to determine whether the position of the diffuser 10 has been adjusted to a suitable position during the measurement of the first initial runout value. The first range threshold can be preset according to the usage requirements and repair process requirements of the diffuser 10. When the difference between the first re-measured runout value and the first initial runout value is within the first range threshold, it indicates that the diffuser 10 is in the first clamping position.

[0099] Furthermore, if the difference between the first remeasured runout value and the first initial runout value exceeds the first range threshold, the surface diffuser 10 will have a large positional offset when adjusting its position. In this case, the diffuser 10 should be repositioned, that is, after adjusting the position of the diffuser 10, the first initial runout value of each first mating surface should be measured again, and the position of the diffuser 10 should be finely adjusted again before measuring the first remeasured runout value, until the difference between the first remeasured runout value and the first initial runout value is within the allowable range, and then the cylinder part 12 of the diffuser 10 should be clamped using the first constant clamping force.

[0100] The first fixed clamping force refers to applying a large radial force to the cylindrical portion 12 of the diffuser 10 to ensure the clamping stability of the diffuser 10 on the worktable 20 and to prevent displacement of the diffuser 10 during subsequent processing. The magnitude of the first fixed clamping force can be determined based on the strength requirements of the diffuser 10 and the operator's experience. In addition, after clamping the diffuser 10 using the first fixed clamping force, the runout value of each first mating surface can be re-measured to confirm whether the diffuser 10 has experienced positional displacement during clamping.

[0101] Specifically, the process of measuring the initial runout value and the retest runout value of multiple first mating surfaces may include:

[0102] Measure the runout value of the reference outer circular surface 101y. If the runout value of the reference outer circular surface 101y is too large, adjust the fixing jaw 32 to minimize the runout value of the reference outer circular surface 101y, and record the runout value of the reference outer circular surface 101y. Measure the runout value of the second outer circular surface 101c, adjust the fixing jaw 32 to minimize the runout value of the second outer circular surface 101c, and record the runout value of the second outer circular surface 101c. Measure the runout value of the first inner circular surface 101e. If the runout value of the first inner circular surface 101e is too large, adjust the fixing jaw 32 to minimize the runout value of the first inner circular surface 101e. The runout value of the first inner circular surface 101e is measured to the minimum and recorded. The runout value of the first end face 101a is measured, and the runout value of the first end face 101a is adjusted to the minimum using the adjustment component 60, and the runout value of the first end face 101a is recorded. The runout value of the second end face 101d is measured, and the runout value of the second end face 101d is adjusted to the minimum using the adjustment component 60, and the runout value of the second end face 101d is recorded. The runout value of the third end face 101f is measured, compared with the runout value of the first end face 101a and the runout value of the second end face 101d, and the runout value of the third end face 101f is recorded.

[0103] The runout value of the reference outer circular surface 101y is remeasured. If the error is large compared with the runout value of the reference outer circular surface 101y measured in the first measurement, the position of the diffuser 10 is readjusted. The runout value of the second outer circular surface 101c is remeasured and compared with the runout value of the second outer circular surface 101c measured in the first measurement to determine the magnitude of the error. The runout value of the first inner circular surface 101e is remeasured and compared with the runout value of the first inner circular surface 101e measured in the first measurement to determine the magnitude of the error. The runout value of the second end face 101d is remeasured and compared with the runout value of the second end face 101d measured in the first measurement to determine the magnitude of the error. The runout value of the third end face 101f is remeasured and compared with the runout value of the third end face 101f measured in the first measurement to determine the magnitude of the error. When all the above errors are within the first range threshold, the diffuser 10 is clamped using the fixing claw 32.

[0104] After clamping the diffuser 10, the runout values ​​of the fourth inner circular surface 101w, the first inner circular surface 101e, the second outer circular surface 101c, the second end face 101d, and the third end face 101f are measured again to determine whether the error between these values ​​and the first measurement of the runout values ​​of each first mating surface is within the first range threshold, thus confirming the accuracy of the clamping position of the diffuser 10.

[0105] In step S303, the first deformation amount of the first mating surface is obtained, and the first mating surface is cut according to the first deformation amount.

[0106] After accurately clamping and positioning the diffuser 10, the first deformation of the first mating surface can be determined based on the runout value of each first mating surface measured in the second retest and the design dimensions of the diffuser 10. The machining parameters are then determined based on the first deformation. The first mating surfaces are then cut using a vertical lathe based on the machining parameters to restore the dimensional accuracy of each first mating surface.

[0107] In some embodiments, obtaining a first deformation amount of the first mating surface and cutting the first mating surface according to the first deformation amount includes:

[0108] Based on the shape of the first mating surface, the first mating surface is divided into a first mating end face and a first mating circumferential surface;

[0109] Measure the deformation of the first mating end face, and cut the first mating end face according to the deformation of the first end face. The deformation of the first end face is the deformation of the first mating end face in the first deformation amount.

[0110] The deformation of the first circumferential surface of the first mating circumferential surface is measured, and the first mating circumferential surface is cut according to the deformation of the first circumferential surface. The deformation of the first circumferential surface is the deformation of the first mating circumferential surface in the first deformation amount.

[0111] Specifically, the first mating end face refers to the horizontal surface disposed on the diffuser 10, and the first mating circumferential surface is the outer or inner circular surface of the diffuser 10. See also... Figure 1 Among the multiple first mating surfaces, the first end face 101a, the second end face 101d, the third end face 101f, the sixth end face 101g, and the seventh end face 101h are all first mating end faces, and the first outer circular surface 101b, the second outer circular surface 101c, the first inner circular surface 101e, and the fourth inner circular surface 101w are all first mating circumferential surfaces.

[0112] It is understandable that the first mating end face can be cut and repaired first, followed by the cutting and repair of each of the first mating circumferential surfaces; alternatively, each of the first mating circumferential surfaces can be cut and repaired first, followed by the cutting and repair of each of the first mating end faces. This embodiment does not impose any restrictions on this approach. When cutting the first mating circumferential surfaces, a round-face cutting tool can be mounted on a vertical lathe; when cutting the first mating end faces, an end-face cutting tool can be mounted on a vertical lathe. By dividing the multiple first mating surfaces into first mating end faces and first mating circumferential surfaces for batch cutting, the number of tool loading and unloading operations can be reduced, improving efficiency.

[0113] In some embodiments, measuring the first end face deformation of the first mating end face and cutting the first mating end face according to the first end face deformation may include:

[0114] Select at least one first mating end face as the first reference surface, determine the deformation amount of the first end face corresponding to the first reference surface based on the first re-measured runout value, and cut the first reference surface based on the deformation amount of the first end face corresponding to the first reference surface.

[0115] Using the first reference surface after cutting as a reference, determine the deformation amount of the first end face corresponding to each of the other first mating end faces, and then cut each of the other first mating end faces.

[0116] By using the first mating end face after cutting as the first reference surface to determine the deformation amount of the first mating end face of subsequent first mating end faces, the dimensional accuracy of the distance between the first mating end faces after turning can be guaranteed. The cutting of each first mating end face can be divided into three steps to improve cutting accuracy and cutting quality. Specifically, a method for sequentially cutting multiple first mating end faces may include:

[0117] Based on the runout value of the first end face 101a after re-measuring in the above steps, determine the first turning amount for the first end face 101a, and perform the first turning on the first end face 101a. After the turning is completed, measure and record the distance between the first end face 101a and the second end face 101d, as well as the runout value of the first end face 101a. Based on the distance between the first end face 101a and the second end face 101d measured after the first turning, determine the second turning amount, and perform the second turning on the first end face 101a. After the first end face 101a and the second end face 101d are finished, the distance between them and the runout of the first end face 101a are measured and recorded. Based on the distance between the first end face 101a and the second end face 101d measured after the second turning, the final turning amount for the third turning is determined. The first end face 101a is turned for the third time. After the turning is completed, the distance between the first end face 101a and the second end face 101d and the runout of the first end face 101a are measured and recorded again, thus completing the turning of the first end face 101a.

[0118] Using the first end face 101a after machining as a reference, and the runout value of the second end face 101d after re-measuring in the above steps, the dimensions to be machined for the second end face 101d are determined. The second end face 101d is machined in three stages. After each machining operation, the distance between the second end face 101d and the first end face 101a, and the runout value of the second end face 101d are measured, until the machining of the second end face 101d is completed. Using the second end face 101d after machining as a reference, and the runout value of the third end face 101f after re-measuring in the above steps, the dimensions to be machined for the third end face 101f are determined. The third end face 101f is machined in three stages. After each machining operation, the distance between the third end face 101f and the second end face 101d, and the runout value of the third end face 101f are measured, until the machining of the third end face 101f is completed. Using the second end face 101d after machining as a reference, and the runout value of the seventh end face 101h after re-measuring in the above steps, determine the dimensions that the seventh end face 101h needs to be machined. The seventh end face 101h is machined in three stages. After each machining operation, the distance between the seventh end face 101h and the second end face 101d, as well as the runout value of the seventh end face 101h, are measured until the machining of the seventh end face 101h is completed. Using the seventh end face 101h after machining as a reference, and the runout value of the sixth end face 101g after re-measuring in the above steps, determine the dimensions that the sixth end face 101g needs to be machined. The sixth end face 101g is machined in three stages. After each machining operation, the distance between the sixth end face 101g and the second end face 101d, as well as the runout value of the sixth end face 101g, are measured until the machining of the sixth end face 101g is completed.

[0119] The deformation of the first mating circumferential surface can be determined by comparing the runout value measured during the second re-measurement of the diffuser 10 during the clamping and positioning process with the original design data of the diffuser 10. Because the diffuser 10 is always clamped on the worktable 20 with the guide vane 13 facing downwards during the sequential cutting of each first mating circumferential surface, the coaxiality of each first mating circumferential surface after cutting and repair is good. Furthermore, the cutting of each first mating circumferential surface can be performed in three or more steps to ensure high cutting accuracy for each first mating surface. Specifically, the steps for sequentially cutting multiple first mating circumferential surfaces may include:

[0120] Based on the runout value of the second outer cylindrical surface 101c during the second re-measurement, the first turning amount is determined and the second outer cylindrical surface 101c is turned for the first time. After the turning is completed, the dimensions of the second outer cylindrical surface 101c and the runout value of the second outer cylindrical surface 101c are measured and recorded. Based on the dimensions of the second outer cylindrical surface 101c measured after the first turning, the second turning amount is determined and the second outer cylindrical surface 101c is turned for the second time. After the second turning is completed, the dimensions of the second outer cylindrical surface 101c and the runout value of the second outer cylindrical surface 101c are measured and recorded. Based on the dimensions of the second outer cylindrical surface 101c measured after the second turning, the final turning amount for the third time is determined and the second outer cylindrical surface 101c is turned for the third time. After the turning is completed, the dimensions of the second outer cylindrical surface 101c and the runout value of the second outer cylindrical surface 101c are measured again. After the second outer cylindrical surface 101c is machined, the first turning amount is determined and the first outer cylindrical surface 101b is turned for the first time. After the turning is completed, the dimensions and runout of the first outer cylindrical surface 101b are measured and recorded. Based on the dimensions of the first outer cylindrical surface 101b measured after the first turning, the second turning amount is determined and the first outer cylindrical surface 101b is turned for the second time. After the second turning is completed, the dimensions and runout of the first outer cylindrical surface 101b are measured and recorded again. Based on the dimensions of the first outer cylindrical surface 101b measured after the second turning, the third final turning amount is determined and the first outer cylindrical surface 101b is turned for the third time. After the turning is completed, the dimensions and runout of the first outer cylindrical surface 101b are measured again.

[0121] In addition, after cutting all the first mating end faces and the first mating circumferential surfaces, a grooving tool can be used to cut the inner surface 101u and the inner surface 101v of the first groove on the flange 11 according to the above cutting method, so as to restore the mating accuracy of the inner surface 101u and the inner surface 101v of the first groove.

[0122] like Figure 9 and Figure 10 As shown, in step S304, the diffuser 10 is clamped onto the worktable 20 along the second direction; the second direction is the direction in which the flange portion 11 of the diffuser 10 faces the worktable 20.

[0123] After the diffuser 10 is clamped on the worktable 20 along the first direction and all the first mating surfaces are cut, the first fixing component 30 is removed, the diffuser 10 is lifted and flipped so that the flange 11 of the diffuser 10 faces down and the guide vane 13 faces up. At this time, multiple second mating surfaces on the diffuser 10 are exposed above the worktable 20 for measurement and cutting repair work on each second mating surface.

[0124] In some embodiments, the worktable 20 is provided with lathe chucks 22; clamping the diffuser 10 onto the worktable 20 along the second direction includes:

[0125] A support pad 50 is installed on the workbench 20; the support pad 50 is multiple and arranged in a circular pattern.

[0126] The flange 11 of the diffuser 10 abuts against the end face of the support pad 50 facing away from the worktable 20.

[0127] Using the lathe chuck 22 to clamp the flange 11, the diffuser 10 is clamped in the second clamping position.

[0128] The support pads 50 used in the above steps when the diffuser 10 is clamped on the worktable 20 in the first direction can be directly used to position the diffuser 10 when it is clamped in the second direction. The diameter of the support pads 50 is determined according to the end face dimensions of the guide vane portion 13 and the flange portion 11, so that multiple support pads 50 can simultaneously support the flange portion 11 and the guide vane portion 13 of the diffuser 10, ensuring positioning accuracy and reducing operation steps. Since the flange portion 11 has been turned first, clamping the flange portion 11 after cutting and repair can also ensure good overall dimensional accuracy of the diffuser 10. A protective gasket can also be provided between the lathe jaws 22 and the outer peripheral surface of the flange portion 11 to protect the outer peripheral surface of the flange portion 11.

[0129] In some embodiments, the diffuser 10 is clamped in a second clamping position by using lathe jaws 22 to hold the flange 11, including:

[0130] The lathe chuck 22 clamps the flange 11 with a second pre-clamping force;

[0131] Measure the second initial runout value of the second mating surface, and adjust the relative position of the diffuser 10 and the worktable 20 to minimize the second initial runout value;

[0132] The second retest runout value of the second mating surface is measured. When the difference between the second initial runout value and the second retest runout value is within the second range threshold, the diffuser 10 is determined to be in the second clamping position, and the second fixing component 40 clamps the cylinder part 12 with a second fixed clamping force; the second fixed clamping force is greater than the second pre-clamping force.

[0133] The second pre-clamping force is a force pre-applied to the diffuser 10 cylinder portion 12. Its purpose is to initially fix the diffuser 10 so that it can undergo a small displacement under external force, thereby adjusting the clamping position of the diffuser 10. The magnitude of the second pre-clamping force can be determined according to process requirements or the operator's experience. For example, it can be made so that the end of the lathe chuck 22 contacts the flange portion 11 of the diffuser 10.

[0134] The second initial runout value can be measured using tools such as a dial indicator. During testing, the dial indicator is mounted on a vertical lathe, and the diffuser 10 is slowly rotated by the worktable 20. The change in the dial indicator reading is recorded to obtain the second initial runout value. During the measurement process, the relative position of the diffuser 10 and the worktable 20 can be adjusted by adjusting the axial or radial displacement of the diffuser 10 to ensure good coaxiality between the reference axis of the diffuser 10 and the axis of the worktable 20, as well as good levelness of the end face of the diffuser 10. This ensures that the deformation of the diffuser 10 can be accurately reflected in subsequent measurements.

[0135] The radial displacement of the diffuser 10 can be achieved by adjusting the position of the lathe jaws 22 at each position. The axial displacement of the diffuser 10 can be achieved by installing at least one adjustment component 60 between the bottom of the diffuser 10 and the worktable 20, and by using the adjustment component 60 to change the distance between the corresponding position of the diffuser 10 and the worktable 20.

[0136] The second re-measured runout value refers to the runout value of each second mating surface of the diffuser 10 measured again using tools such as a dial indicator after the diffuser 10 has been positioned. This determines whether the position of the diffuser 10 has been adjusted to the appropriate position during the measurement of the second initial runout value. The second range threshold can be preset according to the usage requirements of the diffuser 10 and the repair process requirements. When the difference between the second re-measured runout value and the second initial runout value is within the second range threshold, it indicates that the position of the diffuser 10 has been adjusted to the second clamping position.

[0137] Furthermore, if the difference between the second remeasured runout value and the second initial runout value exceeds the second range threshold, the surface diffuser 10 will have a large positional offset when adjusting its position. In this case, the diffuser 10 should be repositioned, that is, after adjusting the position of the diffuser 10, the second initial runout value of each second mating surface should be measured again, and the position of the diffuser 10 should be finely adjusted again before measuring the second remeasured runout value, until the difference between the second remeasured runout value and the second initial runout value is within the allowable range, and then the cylinder part 12 of the diffuser 10 should be clamped using the second constant clamping force.

[0138] The second fixed clamping force refers to applying a larger radial force to the flange portion 11 of the diffuser 10 to ensure the clamping stability of the diffuser 10 on the worktable 20 and to prevent displacement of the diffuser 10 during subsequent processing. The magnitude of the second fixed clamping force can be determined based on the strength requirements of the diffuser 10 and the operator's experience. In addition, after clamping the diffuser 10 using the second fixed clamping force, the runout value of each second mating surface can be re-measured to confirm whether the diffuser 10 has experienced positional displacement during clamping.

[0139] Specifically, the process of measuring the initial runout value and the retest runout value of multiple second mating surfaces may include:

[0140] Measure the runout value of the second outer circular surface 101c, adjust the fixing jaw 32 to minimize the runout value of the second outer circular surface 101c, and record the runout value of the second outer circular surface 101c; measure the runout value of the third outer circular surface 101r, if the runout value of the third outer circular surface 101r deviates too much, adjust the fixing jaw 32 to minimize the runout value of the third outer circular surface 101r, and record the runout value of the third outer circular surface 101r; measure the runout value of the second inner circular surface 101q, if the runout value of the second inner circular surface 101q deviates too much, adjust the fixing jaw 32... The jaw 32 adjusts the runout value of the second inner circular surface 101q to the minimum and records the runout value of the second inner circular surface 101q; the runout value of the third inner circular surface 101z is measured. If the runout value of the third inner circular surface 101z is too large, the fixing jaw 32 is adjusted to adjust the runout value of the third inner circular surface 101z to the minimum and records the runout value of the third inner circular surface 101z; the runout value of the fifth inner circular surface 101m is measured. If the runout value of the fifth inner circular surface 101m is too large, the fixing jaw 32 is adjusted to adjust the runout value of the fifth inner circular surface 101m. Adjust the value to the minimum and record the runout value of the fifth inner circular surface 101m; measure the runout value of the sixth inner circular surface 101i. If the runout value of the sixth inner circular surface 101i deviates too much, adjust the fixing jaw 32 to adjust the runout value of the sixth inner circular surface 101i to the minimum and record the runout value of the sixth inner circular surface 101i; measure the runout value of the seventh inner circular surface 101j. If the runout value of the seventh inner circular surface 101j deviates too much, adjust the fixing jaw 32 to adjust the runout value of the seventh inner circular surface 101j to the minimum and record the runout value of the seventh inner circular surface 101j. The following steps are performed: Measure the runout value of the fifth end face 101p, adjust the runout value of the fifth end face 101p to the minimum using the adjustment component 60, and record the runout value of the fifth end face 101p; Measure the runout value of the fourth end face 101s, adjust the runout value of the fourth end face 101s to the minimum using the adjustment component 60, and record the runout value of the fourth end face 101s; Measure the runout value of the eighth end face 101k, compare it with the runout values ​​of the fifth end face 101p and the fourth end face 101s, and record the runout value of the eighth end face 101k.

[0141] Remeasure the runout value of the second outer circular surface 101c. If the error is large compared with the first measurement, readjust the position of the diffuser 10. Remeasure the runout value of the second inner circular surface 101q and compare it with the first measurement to determine the magnitude of the error. Remeasure the runout value of the third inner circular surface 101z and compare it with the first measurement to determine the magnitude of the error. Remeasure the runout value of the fifth end face 101p and compare it with the first measurement to determine the magnitude of the error. Remeasure the runout value of the fifth inner circular surface 101m and compare it with the first measurement to determine the magnitude of the error. The error magnitude is compared and judged; the runout value of the sixth inner circular surface 101i is re-measured and compared with the first measurement of the runout value of the sixth inner circular surface 101i to judge the error magnitude; the runout value of the seventh inner circular surface 101j is re-measured and compared with the first measurement of the runout value of the seventh inner circular surface 101j to judge the error magnitude; the runout value of the fourth end face 101s is re-measured and compared with the first measurement of the runout value of the fourth end face 101s to judge the error magnitude; the runout value of the eighth end face 101k is re-measured and compared with the first measurement of the runout value of the eighth end face 101k to judge the error magnitude; when all the above errors are within the second range threshold, the diffuser 10 is clamped using the lathe chuck 22.

[0142] After clamping the diffuser 10, the runout values ​​of the second outer circular surface 101c, the second inner circular surface 101q, the third inner circular surface 101z, the fifth end face 101p, the fourth end face 101s, and the eighth end face 101k are measured again to determine whether the error between these values ​​and the first measurement of the runout values ​​of each second mating surface is within the second range threshold, thus confirming the accuracy of the clamping position of the diffuser 10.

[0143] In some embodiments, clamping the diffuser 10 along the second direction onto the worktable 20 further includes: mounting a second fixing component 40 on the worktable 20 and using the second fixing component 40 to apply axial pressure toward the worktable 20 to the flange portion 11 of the diffuser 10.

[0144] The second fixing component 40 is a structure used to apply downward axial pressure to the flange portion 11, as shown in Figures 1 and 2. Multiple second fixing components 40 are also provided, for example, four. These multiple second fixing components 40 can also be arranged in a circle around the axis of the worktable 20, surrounding the flange portion 11 and applying downward axial pressure to the upward-facing end face of the flange portion 11 to clamp and fix it, improving the stability of the diffuser 10 when clamped with the flange portion 11 facing downwards, enhancing the clamping stability of the flange portion 11, and preventing displacement during the turning process caused by the high center of gravity of the diffuser 10.

[0145] like Figure 10As shown, in some embodiments, the second fixing component 40 may include a bottom pad 41, an adjusting pad 43, a pressure plate 42, and a pressure member 44. The bottom pad 41 is connected to the worktable 20, the pressure plate 42 abuts against the side of the bottom pad 41 facing away from the worktable 20, and the pressure member 44 is connected to the worktable 20 for applying pressure to the pressure plate 42 in the direction toward the worktable 20.

[0146] Specifically, the bottom surface of the bottom pad 41 may be provided with a threaded hole. When the bottom pad 41 is installed on the worktable 20, the connecting screw 411 is screwed into the threaded hole at the bottom of the bottom pad 41, and the T-nut 24 is embedded in the corresponding position of the T-slot 21. The bottom of the connecting screw 411 is screwed into the T-nut 24, so that the bottom surface of the bottom pad 41 is in contact with the upper surface of the worktable 20, thereby fixing the bottom pad 41 on the worktable 20.

[0147] The adjusting pad 43 is located on top of the bottom pad 41. An adjusting screw 431 is provided at the end of the adjusting pad 43 facing the bottom pad 41, and the adjusting screw 431 is threadedly connected to the bottom pad 41. The total height of the bottom pad 41 and the adjusting pad 43 can be adapted to the height of the upward-facing end face of the flange 11. The pressure plate 42 is a flat plate structure of a certain length, with a length greater than the width of the bottom pad 41. The pressure plate 42 is placed radially above the adjusting pad 43 along the diffuser 10, with one side of the pressure plate 42 pressing against the upward-facing end face of the flange 11. After the pressure plate 42 is placed, a pressure component 44 applies downward pressure to the pressure plate 42, thereby applying downward axial pressure to the flange 11 through the pressure plate 42. Under the action of multiple fixing components, the flange 11 is pressed tightly onto the worktable 20. By adjusting the shim 43 set on the top of the bottom shim 41, after the pressure plate 42 is placed, the shim 43 can be rotated according to the levelness of the pressure plate 42 to change the top height of the shim 43. The top height of the shim 43 is adjusted to be flush with the upper end face of the flange 11, thereby ensuring that the pressure plate 42 is arranged horizontally and accurately applies pressure to the flange 11.

[0148] The pressure component 44 may include a pressure screw 441 and a pressure nut 442. One end of the pressure screw 441 is connected to the worktable 20. The pressure plate 42 is provided with a through hole through which the pressure screw 441 can pass. The pressure nut 442 is threadedly connected to the pressure screw 441. The pressure screw 441 can be vertically installed on the worktable 20. A T-nut 24 can be pre-embedded in the corresponding position in the T-slot 21. The position of the T-nut 24 is opposite to the position of the through hole on the pressure plate 42. After the pressure screw 441 is passed through the through hole from top to bottom, it is screwed into the T-nut 24 to achieve the connection and fixation of the pressure screw 441 and the worktable 20. After the pressure screw 441 is fixed, the pressure nut 442 is screwed in from the top of the pressure screw 441. By rotating the pressure nut 442, it is made to abut against the upper surface of the pressure plate 42 to apply pressure to the pressure plate 42 towards the worktable 20 side, thereby applying downward axial pressure to the flange 11 through the pressure plate 42. The pressure screw 441 can be installed between the bottom pad 41 and the diffuser 10, close to the part where the pressure plate 42 contacts the flange 11, so as to better apply downward pressure to the flange 11 through the pressure plate 42.

[0149] In step S305, the second deformation amount of the second mating surface is obtained, and the second mating surface is cut according to the second deformation amount.

[0150] After accurately clamping and positioning the diffuser 10, the second deformation amount of the second mating surface can be determined based on the runout value of each second mating surface measured in the second retest and the design dimensions of the diffuser 10. The machining parameters are then determined based on the second deformation amount. The machining parameters are used to cut each second mating surface using a vertical lathe to restore the dimensional accuracy of each second mating surface.

[0151] In some embodiments, obtaining a second deformation amount of the second mating surface and cutting the second mating surface according to the second deformation amount includes:

[0152] Based on the shape of the second mating surface, the second mating surface is divided into the second mating end face and the second mating circumferential surface;

[0153] Measure the deformation of the second end face, and cut the second mating end face according to the deformation of the second end face. The deformation of the second end face is the deformation of the second mating end face in the second deformation amount.

[0154] Measure the deformation of the second circumferential surface, and cut the second mating circumferential surface according to the deformation of the second circumferential surface. The deformation of the second circumferential surface is the deformation of the second mating circumferential surface in the second deformation.

[0155] Specifically, the second mating end face refers to the horizontal surface disposed on the diffuser 10, and the second mating circumferential surface is the outer or inner circular surface of the diffuser 10. See also... Figure 1Among the multiple second mating surfaces, the fourth end face 101s, the fifth end face 101p, the seventh end face 101h, the eighth end face 101k, and the ninth end face 101n are all second mating end faces, and the third outer circular surface 101r, the second inner circular surface 101q, the third inner circular surface 101z, the fifth inner circular surface 101m, the sixth inner circular surface 101i, and the seventh inner circular surface 101j are all second mating circumferential surfaces.

[0156] It is understandable that the second mating end face can be cut and repaired first, followed by the cutting and repair of each of the second mating circumferential surfaces; alternatively, each of the second mating circumferential surfaces can be cut and repaired first, followed by the cutting and repair of each of the second mating end faces. This embodiment does not impose any restrictions on this approach. When cutting the second mating circumferential surfaces, a round-face cutting tool can be mounted on a vertical lathe; when cutting the second mating end faces, an end-face cutting tool can be mounted on a vertical lathe. By dividing the multiple second mating surfaces into second mating end faces and second mating circumferential surfaces for batch cutting, the number of tool loading and unloading operations can be reduced, improving efficiency.

[0157] In some embodiments, measuring the deformation of the second end face of the second mating end face and cutting the second mating end face according to the deformation includes:

[0158] Select at least one of the second mating end faces as the second reference surface, determine the deformation amount of the second end face corresponding to the second reference surface based on the second re-measured runout value, and cut the second reference surface based on the deformation amount of the second end face corresponding to the second reference surface.

[0159] Using the cut second reference surface as a reference, determine the second end deformation corresponding to each of the remaining second mating end faces, and cut each of the remaining second mating end faces.

[0160] By using the cut second mating end face as the second reference surface to determine the deformation amount of the subsequent second mating end faces, the dimensional accuracy of the distance between each second mating end face after turning can be guaranteed. The cutting of each second mating end face can be divided into three steps to improve cutting accuracy and quality. Specifically, a method for sequentially cutting multiple second mating end faces may include:

[0161] Based on the runout value of the fifth end face 101p after re-measuring in the above steps, determine the second turning amount for the fifth end face 101p, and perform a second turning on the fifth end face 101p. After the turning is completed, measure and record the distance between the fifth end face 101p and the fourth end face 101s, as well as the runout value of the fifth end face 101p. Based on the distance between the fifth end face 101p and the fourth end face 101s measured after the second turning, determine the second turning amount, and perform a second turning on the fifth end face 101p. After the first turning, measure and record the distance between the fifth end face 101p and the fourth end face 101s, as well as the runout value of the fifth end face 101p. Based on the distance between the fifth end face 101p and the fourth end face 101s measured after the second turning, determine the final turning amount for the third turning and perform the third turning on the fifth end face 101p. After the turning is completed, measure and record the distance between the fifth end face 101p and the fourth end face 101s, as well as the runout value of the fifth end face 101p, to complete the turning of the fifth end face 101p.

[0162] Using the fifth end face 101p after machining as a reference, and the runout value of the fourth end face 101s after re-measuring in the above steps, determine the dimensions that the fourth end face 101s needs to be machined. The fourth end face 101s is machined in three stages. After each machining operation, the distance between the fourth end face 101s and the fifth end face 101p, as well as the runout value of the fourth end face 101s, are measured until the machining of the fourth end face 101s is completed. Using the fifth end face 101p after machining as a reference, and the runout value of the eighth end face 101k after re-measuring in the above steps, determine the dimensions that the eighth end face 101k needs to be machined. The eighth end face 101k is machined in three stages. After each machining operation, the distance between the eighth end face 101k and the fifth end face 101p, as well as the runout value of the eighth end face 101k, are measured until the machining of the eighth end face 101k is completed. Using the eighth end face 101k after turning as a reference, and the runout value of the ninth end face 101n after re-measuring in the above steps, the dimensions that the ninth end face 101n needs to be turned are determined, and the ninth end face 101n is turned in three stages. After each turning, the distance between the seventh end face 101h and the eighth end face 101k and the runout value of the ninth end face 101n are measured until the turning of the seventh end face 101h is completed.

[0163] The deformation of the second mating circumferential surface can be determined by comparing the runout value measured during the second re-measurement of the diffuser 10 during the clamping and positioning process with the original design data of the diffuser 10. Because the diffuser 10 is always clamped on the worktable 20 with the guide vane 13 facing downwards during the sequential cutting of each second mating circumferential surface, the coaxiality of each second mating circumferential surface after cutting and repair is good. Furthermore, the cutting of each second mating circumferential surface can be performed in three or more steps to ensure high cutting accuracy for each second mating surface. Specifically, the steps for sequentially cutting multiple second mating circumferential surfaces may include:

[0164] Based on the runout value of the second inner circular surface 101q during the second re-measurement, the second turning amount is determined and the second inner circular surface 101q is turned a second time. After the turning is completed, the dimensions of the second inner circular surface 101q and the runout value of the second inner circular surface 101q are measured and recorded. Based on the dimensions of the second inner circular surface 101q measured after the second turning, the second turning amount is determined and the second inner circular surface 101q is turned a second time. After the second turning is completed, the dimensions of the second inner circular surface 101q and the runout value of the second inner circular surface 101q are measured and recorded. Based on the dimensions of the second inner circular surface 101q measured after the second turning, the final turning amount for the third time is determined and the second inner circular surface 101q is turned a third time. After the turning is completed, the dimensions of the second inner circular surface 101q and the runout value of the second inner circular surface 101q are measured again. After the second inner circular surface 101q is machined, the third inner circular surface 101z, the third outer circular surface 101r, the fifth inner circular surface 101m, the sixth inner circular surface 101i, and the seventh inner circular surface 101j are machined in sequence according to the above method. Each second mating circumferential surface is cut at least three times until all the second mating circumferential surfaces are cut.

[0165] It should be noted that the clamping order of the diffuser 10 in this embodiment is not limited. Steps S302 and S303 can be executed first, clamping the diffuser 10 onto the worktable 20 with the guide vane 13 facing downwards. After all the first mating surfaces have been cut and repaired, the diffuser 10 is lifted from the support pad 50 and rotated 180° using a flipping device. Then, steps S304 and S305 are executed, clamping the diffuser 10 onto the worktable 20 with the flange 11 facing downwards, and cutting all the second mating surfaces. Alternatively, steps S304 and S305 can be executed first, clamping the diffuser 10 onto the worktable 20 with the flange 11 facing downwards, completing the cutting and repair of all the second mating surfaces, and then steps S302 and S303 are executed, clamping the diffuser 10 onto the worktable 20 with the guide vane 13 facing downwards, and cutting and repairing all the first mating surfaces.

[0166] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for repairing the diffuser of a hydraulic component of a main pump in a nuclear power plant, the diffuser comprising a flange, a cylindrical body, and guide vanes, wherein the processing equipment for repairing the diffuser includes a workbench; characterized in that, The diffuser repair method includes: The multiple mating surfaces of the diffuser are divided into a first mating surface and a second mating surface; the first mating surface includes a mating surface located on the flange portion and a mating surface located on the cylindrical portion facing and near the flange portion; the second mating surface includes a mating surface located on the guide vane portion and a mating surface located on the cylindrical portion facing and near the guide vane portion; The diffuser is clamped onto the worktable along a first direction; the first direction is the direction in which the guide vane faces the worktable. Obtain the first deformation amount of the first mating surface, and cut the first mating surface according to the first deformation amount; The diffuser is clamped onto the worktable along a second direction; the second direction is the direction in which the flange faces the worktable. Obtain the second deformation amount of the second mating surface, and cut the second mating surface according to the second deformation amount; The workbench is equipped with support pads; clamping the diffuser onto the workbench along a first direction includes: installing support pads on the workbench; the number of support pads is multiple and arranged in a circular pattern; the guide vane portion abuts against the end face of the support pad facing away from the workbench; installing a first fixing component on the workbench, the number of first fixing components being multiple and surrounding the periphery of the diffuser; using the first fixing component to clamp the cylindrical portion, clamping the diffuser at a first clamping position; The step of using the first fixing component to clamp the cylindrical part and clamp the diffuser in the first clamping position includes: clamping the cylindrical part with the first fixing component using a first pre-clamping force; measuring a first initial runout value of the first mating surface and adjusting the relative position of the diffuser and the worktable to minimize the first initial runout value; measuring a first re-measured runout value of the first mating surface; when the difference between the first initial runout value and the first re-measured runout value is within a first range threshold, determining that the diffuser is in the first clamping position, and clamping the cylindrical part with the first fixing component using a first fixed clamping force; the first fixed clamping force is greater than the first pre-clamping force.

2. The method for repairing the diffuser of the hydraulic components of the main pump in a nuclear power plant according to claim 1, characterized in that, The step of obtaining the first deformation amount of the first mating surface and cutting the first mating surface according to the first deformation amount includes: Based on the shape of the first mating surface, the first mating surface is divided into a first mating end face and a first mating circumferential surface; The deformation of the first end face is measured, and the first mating end face is cut according to the deformation of the first end face. The deformation of the first end face is the deformation of the first mating end face in the first deformation. The deformation of the first circumferential surface is measured, and the first mating circumferential surface is cut according to the deformation of the first circumferential surface. The deformation of the first circumferential surface is the deformation of the first mating circumferential surface in the first deformation.

3. The method for repairing the diffuser of the hydraulic components of the main pump in a nuclear power plant according to claim 2, characterized in that, The number of first mating end faces is multiple, and the deformation amount of the first end face is also multiple. Measuring the deformation amount of the first end face and cutting the first mating end face according to the deformation amount includes: At least one of the first mating end faces is selected as the first reference surface. The deformation amount of the first end face corresponding to the first reference surface is determined according to the first remeasured runout value. The first reference surface is then cut according to the deformation amount of the first end face corresponding to the first reference surface. Using the first reference surface after cutting as a reference, determine the deformation amount of the first end face corresponding to each of the remaining first mating end faces, and cut each of the remaining first mating end faces.

4. The method for repairing the diffuser of the hydraulic components of the main pump in a nuclear power plant according to claim 1, characterized in that, The worktable is equipped with lathe chucks and support blocks; the step of clamping the diffuser onto the worktable along the second direction includes: Support blocks are installed on the workbench; the number of support blocks is multiple and they are arranged in a circular pattern. The flange portion abuts against the end face of the support pad that faces away from the workbench; The flange is clamped using the lathe jaws, and the diffuser is clamped in the second clamping position.

5. The method for repairing the diffuser of the hydraulic components of the main pump in a nuclear power plant according to claim 4, characterized in that, The step of using the lathe chuck to clamp the flange and mount the diffuser in the second clamping position includes: The lathe jaws clamp the flange with a second pre-clamping force; Measure the second initial runout value of the second mating surface, and adjust the relative position of the diffuser and the worktable to minimize the second initial runout value; Measure the second retest runout value of the second mating surface; When the difference between the second initial runout value and the second retest runout value is within the second range threshold, the diffuser is determined to be in the second clamping position, and the lathe jaws clamp the flange with a second fixed clamping force; the second fixed clamping force is greater than the second pre-clamping force.

6. The method for repairing the diffuser of the hydraulic components of the main pump in a nuclear power plant according to claim 5, characterized in that, The step of obtaining the second deformation amount of the second mating surface and cutting the second mating surface according to the second deformation amount includes: Based on the shape of the second mating surface, the second mating surface is divided into a second mating end face and a second mating circumferential surface; Measure the deformation of the second end face, and cut the second mating end face according to the deformation of the second end face. The deformation of the second end face is the deformation of the second mating end face in the second deformation amount. The deformation of the second circumferential surface is measured, and the second mating circumferential surface is cut according to the deformation of the second circumferential surface. The deformation of the second circumferential surface is the deformation of the second mating circumferential surface in the second deformation amount.

7. The method for repairing the diffuser of the hydraulic components of the main pump in a nuclear power plant according to claim 6, characterized in that, The number of second mating end faces is multiple, and the deformation amount of the second end face is also multiple. Measuring the deformation amount of the second end face and cutting the second mating end face according to the deformation amount includes: Select at least one of the second mating end faces as the second reference surface, determine the deformation amount of the second end face corresponding to the second reference surface based on the second remeasured runout value, and cut the second reference surface based on the deformation amount of the second end face corresponding to the second reference surface; Using the cut second reference surface as a reference, determine the deformation amount of the second end face corresponding to each of the remaining second mating end faces, and cut each of the remaining second mating end faces.

8. The method for repairing the diffuser of the hydraulic components of the main pump in a nuclear power plant according to any one of claims 4-7, characterized in that, The step of clamping the diffuser onto the worktable along the second direction further includes: A second fixing component is installed on the workbench, and the second fixing component is used to apply axial pressure toward the workbench to the flange portion; there are multiple second fixing components and they are arranged around the periphery of the diffuser.

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